Heating unit.



P. M. VOGEL.

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FREDERICK H.' VOGEL, OIF PITTSI'IELD, MASSACHUSETTS, ASSIGNOB TO GENERALELECTRIC COMPANY. A CORPORATION OF NEW YORK.

HEATING UNIT.

Specification of Letters Patent.

PatentedN0v.4,1913.

1913. serial No. 773,169.

To all whom it may concern Be it known that I, FREDERICK M. VOGEL,States, residin at Pittsfield, in the county of Berkshire, tate ofMassachusetts, have invented certain new. and useful Im rovements inHeating Units. of which the ollowing is a specification.

My invention relates to electric heaters and particularly to a novelheating unit tor use in electric ranges, although the novel features ofmy structure may be used in construct-ing a heating unit for use withany desired type of heating device.

One of the objects of the invention is to provide an improved means forinsulating the resistance element from its carrying trame.

Another object is to so construct the unit that it will not-warp out ofshape due to repeated heating and cooling and also to so design the samethat the resistance element may be easily and quickly replaced in caseit should burn out.

Other objects of my invention will appear in the course of-the followingspecification wherein I have fully described one form which myinventio-n may take.

Referring to the drawings, Figure 1 is a plan View of my heating unitthe upper portion being shown partly in section; Fig. 2 is an endelevation thereof; Fig. 3 is a side elevation of one of the insulatinghushings; Fig. 4: is a section on line 4-4 of Fig. 3.

In the drawing the resistance element 1 is shown as being carried byarectangular rame made up of two U-shaped side niembers 2 and 3, and apluralit of cross-strips 4. These cross-strips 4 eac comprise two metalstri s 5 and 6l suitably fastened togetheras or inst-ance, by spotwelding, and having their ends bent at right angles as shown ati? `toform'spacing members. These cross-strips are of such a width that theangular ends tit snugl i within the U- shaped side members an only thetwo end cross strips are fastened to the side niembers suitablefastening means being shown in the form of screws 8. By this means itwill be seen that the parts are free to permitof expansion andcontraction and that no war ing will result from repeated heating ancooling.

The metal strips 5 9 having embossed said side strips,

peripheries as clearly shownv in Fig. 4. Clamped by their outer edgesbetween these stris and fitting in the embossed portions of t e openingsare annular insulating disks 10 to the inner edges of which are fastenedmetallic 'rivets 11. These rivets are made of a non-corroding heatresisting metal such for instance, as Monel metal. The resistanceelement l which may be of any desired type and which is here shown as acoiled wire, is made in two sections and is threaded back and forththrough the eyelets of the cross strips 4. When the resistance elementextends parallel with the cross strips as at the ends, the eyelets carrysuitable rings 12 spaced from the cross strips through which theresistance element passes. Two bus rods 13 and 14 one for each sectionot the heating element and a common bus bar 15 are illustrated, thearrangement of the same being clear from the drawing. By thisarrangement a section of the heating` element can be quickly replacedwithout disassembling the frame. I also secure a decided advantage bythe arrangen'ientI of the insulating bushing in that the heating elementis at all points adjacent to metal only whereby any tendency of fiuxingwhich might otherwise take place is avoided.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is

1. A heating unit comprising angular side strips, a plurality of crossstrips having angularly bent ends loosely supported by said side stripsand a resistance element cal'.- ried by said cross strips.

2. A hea-tin unit comprising U-shaped side strips, a p urality of crossstrips having angularly bent ends loosely supported by and a resistanceelement carried by said cross strips. l

3. Av heating unit comprising U-shaped side strips'fa plurality of crossstrips each includingltwo members joined together and having t eir endsangularly bent in opposite directions, said angularly bent ends fittingin said U-shaped side strips, and a resistance element carried by saidcross strips.

4:. A heating unit comprising U-shaped side strips, a plurality of crossstrips each including two membersv oined together, and having their endsangularly bent in opposite directions, said an ularly bent ends fittingiin said U-shaped side strips, means for fastening the outermost crossstrips to said lll of insulating material supported atits outer' edge insaid opening and a metal eyelet clamping the inner edge ot said annular,

disk.

G. In a heating unit, a metal cross strip `having an opening therein, anembossed edge around said opening, an annular disk of insulatingmaterial clamped in the elnbossed edge around said opening, and a metaleyelet Clamping the inner edge of said annular disk.

T. In a heating unit. a metal cross strip eoniprising tivo membersjoinedtogether and i having almed openings therethrough, erni bossededges around said openings, annular disks oi' insulating materialclamped in said openings between the embossed edges and metal eyeletsclamping the inner edges ot said annular disks.

8. In a heating unit, a metal cross strip comprising two members oinedtogether and i having alined openings therethrough, annular disks ofinsulating material clamped be- ;tween said members and in said openingsand metal eyelets clamping the inner edges of said annular disks.

9. A heating unit comprising U-shaped side members, ay plurality ofcross strips each including two members joined together and having theirends angularly bent in optitting in said U-shaped side members, saidfcross strips being further provided with openings therethrough, annulardisks of inl sulating material clamped between the inembers of therespective strips in said openings, metal eyelets clamping the inneredges of said annular disks and a resistance element threaded throughsaid eyelets on said cross strips.

In Witness whereof, I have hereunto set my hand this 10th day of June1913.

FREDERICK M. VOGEL. lVitnesses II. NUGENT, A. K. NUGENT.

posite directions, said angularly bent` ends l AIl)

